creating global prelaunch hook for OCIO env var

openpype/hooks/pre_ocio_hook.py

@@ -0,0 +1,42 @@
+from openpype.lib import PreLaunchHook
+
+from openpype.pipeline.colorspace import get_imageio_config
+from openpype.pipeline.template_data import get_template_data_with_names
+
+
+class OCIOEnvHook(PreLaunchHook):
+    """Set OCIO environment variable for hosts that use OpenColorIO."""
+
+    order = 0
+    app_groups = [
+        "fusion",
+        "blender",
+        "aftereffects",
+        "3dsmax",
+        "houdini"
+    ]
+
+    def execute(self):
+        """Hook entry method."""
+
+        template_data = get_template_data_with_names(
+            project_name=self.data["project_name"],
+            asset_name=self.data["asset_name"],
+            task_name=self.data["task_name"],
+            host_name=self.host_name,
+            system_settings=self.data["system_settings"]
+        )
+
+        config_data = get_imageio_config(
+            project_name=self.data["project_name"],
+            host_name=self.host_name,
+            project_settings=self.data["project_settings"],
+            anatomy_data=template_data,
+            anatomy=self.data["anatomy"]
+        )
+
+        if config_data:
+            ocio_path = config_data["path"]
+
+            self.log.info(f"Setting OCIO config path: {ocio_path}")
+            self.launch_context.env["OCIO"] = ocio_path